fix string slicing under 1.9 after short writes

Fortunately this only affects the hardly-used FiberSpawn and
FiberPool concurrency models, and also unreleased revisions of
Rev.  1.9 encoding is tricky to handle right when doing I/O in
Ruby...

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/rainbows/rev/client.rb b/lib/rainbows/rev/client.rb
index f854a63..bc8d7fa 100644
--- a/lib/rainbows/rev/client.rb
+++ b/lib/rainbows/rev/client.rb
@@ -4,6 +4,7 @@ module Rainbows
   module Rev
 
     class Client < ::Rev::IO
+      include Rainbows::ByteSlice
       include Rainbows::EvCore
       include Rainbows::HttpResponse
       G = Rainbows::G
@@ -33,7 +34,7 @@ module Rainbows
             end
             # we never care for the return value, but yes, we may return
             # a "fake" short write from super(buf) if anybody cares.
-            buf = buf[w..-1]
+            buf = byte_slice(buf, w..-1)
           rescue Errno::EAGAIN
             break # fall through to super(buf)
           rescue